upgrade babel preset

package.json

@@ -41,7 +41,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.7.5",
-    "@babel/polyfill": "^7.0.0",
+    "@babel/preset-env": "^7.7.6",
     "@vue/test-utils": "^1.0.0-beta.26",
     "autoprefixer": "^6.4.0",
     "babel-eslint": "^7.0.0",
@@ -50,9 +50,6 @@
     "babel-plugin-syntax-jsx": "^6.18.0",
     "babel-plugin-transform-runtime": "^6.0.0",
     "babel-plugin-transform-vue-jsx": "3",
-    "babel-preset-env": "^1.7.0",
-    "babel-preset-es2015": "^6.0.0",
-    "babel-preset-stage-2": "^6.0.0",
     "babel-register": "^6.0.0",
     "chai": "^3.5.0",
     "chalk": "^1.1.3",